What Is Identity Resolution? How It Works for B2B & B2C 2026

The Short Answer

Identity resolution is the process of connecting fragmented data points — an email address, a cookie, an IP address, a phone number — to a single, verified person. The goal is to take anonymous or partial signals and match them to a real individual in your database (or in a larger data graph).

When someone visits your website without filling out a form, you have a signal (a session, a page view, a click) but no identity. Identity resolution is how you close that gap.

Why It Matters

The average B2B website converts about 2–3% of visitors. That means 97% of the people who show buying intent — by visiting your pricing page, reading your case studies, comparing your plans — leave without any trace.

Identity resolution lets you identify a portion of those visitors and follow up. In consumer marketing, it lets you match your CRM records to the same person across channels: email, direct mail, paid ads, and phone.

How Identity Resolution Works

There are two broad approaches:

Deterministic Matching

Deterministic matching uses known identifiers — email addresses, phone numbers, login cookies — to make an exact match. If someone fills out a form with their email, and that email exists in your database (or a larger identity graph), you've made a deterministic match. This is the most accurate approach.

Probabilistic Matching

Probabilistic matching uses behavioral and contextual signals — IP address, device type, location, browsing patterns — to infer identity with statistical confidence. No single signal is definitive, but a combination of signals narrows the field. "This IP address, on this device, visiting these pages, in this geography" — the probability that this is a specific known person rises as signals accumulate.

Most enterprise-grade identity resolution systems use both: deterministic first, probabilistic for the gaps.

B2B vs. B2C Identity Resolution

The mechanics are similar, but the data sources and use cases diverge significantly.

B2B Identity Resolution

B2B identity resolution typically resolves anonymous visitors to a company first — "this IP address belongs to Acme Corp" — and then matches to specific professional contacts within that company using tools like LinkedIn data or CRM records. Tools like Warmly, Clearbit Reveal, and 6sense operate in this space.

The output is typically: company name, company size, industry, and a shortlist of contacts to outreach. The match rate is lower because IP-to-company matching is imprecise and the target universe (companies) is smaller.

B2C Identity Resolution

Consumer identity resolution resolves visitors or data records to individual people — not companies. The signals are different: consumer email addresses, phone numbers, physical addresses, and device fingerprints. The data graph is larger (250M+ U.S. consumer profiles vs. a few million companies).

The output is: individual name, email, phone, physical address, and often behavioral profile. Match rates are higher for consumer audiences because the data graph is denser and deterministic signals (email, phone) are more common.

The Four Core Identity Resolution Use Cases

1. Website Visitor Identification

A pixel or script on your website captures visitor signals. (Site ID is how Exact Match does this for consumer audiences.) The identity resolution system matches those signals to profiles in the data graph. Output: a daily or real-time list of identified visitors with contact information.

2. List Enrichment

You have a partial list — names and emails, or emails and company names. Identity resolution fills in the gaps: phone numbers, physical addresses, job titles, behavioral attributes. This is sometimes called "data enrichment" or "clean ID," and when you weigh the cost against how many more contacts become reachable, the ROI of enrichment usually comes out ahead.

3. Cross-Channel Identity Stitching

A customer buys from you via email. Later, they visit your website from a mobile device. Identity resolution links those sessions so your marketing platform treats them as the same person — enabling personalization, attribution, and suppression to work correctly.

4. Audience Building

You define a target profile — behavioral attributes, demographic filters, life events. The identity resolution graph returns a list of individuals who match that profile. This is how Audience ID works: you describe your ideal customer, and the system finds them in the data graph. From there, prioritizing leads with behavioral data helps smaller teams focus outreach on the people already showing intent.

What to Look for in an Identity Resolution Platform

• Match rate: What percentage of signals can the system resolve to a confirmed identity? Higher is better, but accuracy matters more than raw rate.
• Data freshness: Identity data decays — people change jobs, email addresses, and phone numbers. How often is the graph updated?
• Compliance: CCPA requires opt-out mechanisms for consumer data. Any identity resolution platform touching U.S. consumer data must be CCPA-compliant.
• Output format: Does the platform deliver data in a format your team can act on — CSV export, CRM integration, or API?
• Consumer vs. B2B: The graph you need depends on your audience. Consumer graphs (ExactMatch, LiveRamp) and B2B graphs (Clearbit, 6sense) are built on different data sources.

How Site ID Fits In

Exact Match's Site ID is a consumer-focused website visitor identification product. Install the pixel, and Site ID matches anonymous visitors to profiles in the 250M+ consumer graph. The output is a list of identified visitors — name, email, and behavioral profile — delivered to your dashboard daily. Because those profiles arrive already enriched, combining visitor ID with enrichment in one step avoids the handoff between two separate tools.

Unlike B2B visitor ID tools that reveal company names, Site ID resolves to individual consumers. That matters for B2C brands, direct-to-consumer retailers, and any business whose buyers are individuals rather than corporate procurement teams.

The Bottom Line

Identity resolution closes the gap between anonymous signals and actionable contacts. The right approach depends on whether your audience is businesses (B2B: company-level reveal first) or consumers (B2C: individual-level matching from a consumer graph). Most teams need both — but rarely the same tool for both.